... Biodegradability of zinc binding sites in DOM of WWTP effluent in river water Fig shows the variation of DOC, UV254 and SUVA during the incubation of DOM in WWTP effluent with river water, where river water ... out for river water and river water spiked with DOM from WWTP effluent to evaluate the biological alteration of zinc complexation characteristics of DOM under river water environment Zinc complexation ... hypothesized that, unlike binding sites in DOM of the river water, binding sites in DOM of WWTP effluents were less biodegradable In other words, treatment of wastewater by activated sludge process...